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-rw-r--r--src/main/scala/firrtl/backends/experimental/smt/StutteringClockTransform.scala3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/main/scala/firrtl/backends/experimental/smt/StutteringClockTransform.scala b/src/main/scala/firrtl/backends/experimental/smt/StutteringClockTransform.scala
index 5db39ac9..534db217 100644
--- a/src/main/scala/firrtl/backends/experimental/smt/StutteringClockTransform.scala
+++ b/src/main/scala/firrtl/backends/experimental/smt/StutteringClockTransform.scala
@@ -11,6 +11,7 @@ import firrtl.passes.PassException
import firrtl.stage.Forms
import firrtl.stage.TransformManager.TransformDependency
import firrtl.transforms.PropagatePresetAnnotations
+import firrtl.renamemap.MutableRenameMap
import scala.collection.mutable
@@ -94,7 +95,7 @@ class StutteringClockTransform extends Transform with DependencyAPIMigration {
// rename clocks to clock enable signals
val mRef = CircuitTarget(state.circuit.main).module(main.name)
- val renameMap = RenameMap()
+ val renameMap = MutableRenameMap()
scan.clockToEnable.foreach {
case (clk, en) =>
renameMap.record(mRef.ref(clk), mRef.ref(en.name))